Formula: Sc(PO4).2H2O
Hydrated phosphate, metavariscite group,
scandium-bearing mineral
Crystal System: Monoclinic
Specific gravity: 2.36 measured, 2.35 calculated
Hardness: 3 to 5
Streak: White
Colour: Colourless, light yellow; when impure: cyan-blue, blue-gray, apple-green
Solubility: Decomposed by acids
Environments:
Kolbeckite is one of the few scandium-bearing minerals. It is a rare
secondary
mineral in phosphate deposits and some hydrothermal veins. Associated minerals include
crandallite, gypsum,
lithiophorite, malhmoodite,
variscite, vernadite and
wardite
(Mindat).
Localities
At Putty Beach, Woy Woy Peninsula, Woy Woy, Northumberland county, New South Wales, Australia, kolbeckite is
associated with
lithiophorite, vernadite and
gypsum
(HOM).
At the type locality, Sadisdorf, Dippoldiswalde, Sächsische Schweiz-Osterzgebirge, Saxony, Germany, kolbeckite
is found in a
quartz
hübnerite-ferberite
vein
(Dana), associated with quartz and
chlorite
(Mindat, HOM).
At the Baia Sprie mine, Baia Sprie, Maramureș, Romania, kolbeckite is associated with
miargyrite and diaphorite
(HOM).
At the North Wilson pit, Union Carbide Mine, Wilson Springs, Garland county, Arkansas, USA, kolbeckite is
associated with
malhmoodite
(HOM).
At the Little Green Monster Variscite Mine, Clay Canyon, Fairfield, Oquirrh Mountains, Utah county, Utah, USA,
kolbeckite is associated
with wardite, crandallite and
variscite
(HOM).
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